Spi 15-445-0 Telescoping Gage 5/16 to 1/2 in 12 in

Product Description

The SPI 15-445-0 is a telescoping gage used to measure internal bore diameters in the range of 5/16 to 1/2 inch. The tool transfers the internal measurement to an outside micrometer or caliper for a precise reading. Built on a 12-inch handle of hardened tool steel with a satin chrome finish, it provides rigidity and corrosion resistance during repeated use. Machinists, pipefitters, and maintenance technicians reach for this type of gage when checking cylinder bores, valve seats, pipe fittings, or any inside dimension that a fixed-jaw caliper cannot reach cleanly.

This telescoping gage is suited for shop, field, and maintenance applications where internal diameter verification is required. It fits into tight bore openings in the 5/16 to 1/2 inch range and works alongside standard outside micrometers to yield accurate measurements. Typical uses include inspection of hydraulic fittings, pump housings, small bore cylinders, and plumbing connection ports. The 12-inch overall length allows the technician to reach recessed bores without repositioning the workpiece.

Key Features

• Measurement range: 5/16 to 1/2 inch internal diameter
• 12-inch overall handle length for reaching recessed bores
• Hardened tool steel construction for durability under repeated use
• Satin chrome finish resists corrosion and reduces glare
• Transfer-measurement design works with any outside micrometer or caliper

Compatibility

Designed as a standard telescoping gage for use with outside micrometers and calipers capable of measuring in the 5/16 to 1/2 inch range. No proprietary adapter or mating tool is required.

Installation Notes

A licensed machinist or qualified maintenance technician should operate this gage. Compress the telescoping contacts before inserting into the bore, then allow the spring-loaded contacts to expand against the bore wall before locking the handle. Transfer the locked measurement to an outside micrometer immediately to avoid shifting. Clean and dry the contact points before each use to prevent measurement error from debris or fluid buildup.